CN115614046B - Advanced grouting process for shield construction - Google Patents
Advanced grouting process for shield construction Download PDFInfo
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- CN115614046B CN115614046B CN202211638089.5A CN202211638089A CN115614046B CN 115614046 B CN115614046 B CN 115614046B CN 202211638089 A CN202211638089 A CN 202211638089A CN 115614046 B CN115614046 B CN 115614046B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/001—Improving soil or rock, e.g. by freezing; Injections
Abstract
The invention discloses an advanced grouting process for shield construction, which comprises the following steps: step one, determining a reinforcing grouting position; step two, installing a grouting device and performing drilling operation; grouting the soil layer through a grouting pipeline, wherein equipment adopted in the grouting process comprises a first grouting pipe, a second grouting pipe and a third pipe group; the first grouting pipe is a hard pipe, and the second grouting pipe comprises an inner pipe, a grouting head and a communicating pipe; the inner pipe is positioned in the first grouting pipe; grouting heads are uniformly distributed on the inner pipe, and the axis of each grouting head is perpendicular to that of the inner pipe; the sleeve is fixed in the communicating pipe; the moving pipe is positioned in the sleeve, and can extend into the inner pipe through the sleeve; and the pipe is moved, so that grouting can be performed in the inner pipe. The grouting process is convenient for controlling pressure and grouting components.
Description
Technical Field
The invention relates to a grouting process in shield construction, in particular to a method for performing advanced grouting on a soil layer in shield construction.
Background
In subway construction, the distance of the superposed sections is short, and in order to reinforce an address structure, advanced grouting operation is usually performed.
The existing advanced grouting process adopts a double-layer pipeline to perform grouting operation on a soil layer. However, in actual measurement, it is found that the pressure control difficulty of the two slurries at the grouting hole between the inner pipe and the outer pipe is high, and the components of the two slurries are easy to generate large deviation in local grouting.
Disclosure of Invention
The embodiment of the application provides an advanced grouting process for shield construction, solves the problem that the proportion of two-component grout is out of order in the local part in the prior art, and achieves the effect of component balanced grouting.
The embodiment of the application provides an advanced grouting process for shield construction, which comprises the following steps: step one, determining a reinforcing grouting position; step two, installing a grouting device and performing drilling operation; grouting the soil layer through a grouting pipeline, wherein in the grouting process, two different kinds of grout are injected into the soil layer through an inner sleeve and an outer sleeve, the first kind of grout is water glass solution, and the second kind of grout is cement paste;
the equipment adopted in the grouting process comprises a first grouting pipe, a second grouting pipe and a third pipe group;
the first grouting pipe is a hard pipe and comprises a grouting hole, a sealing plate and a liquid injection pipe;
the front section of the first grouting pipe is closed, the tail end of the first grouting pipe is sealed by a sealing plate, and the liquid injection pipe penetrates through the sealing plate to perform grouting in the first grouting pipe; the liquid injection pipe is communicated with a grouting pump of the first kind of slurry;
grouting holes are uniformly formed in the pipe surface of the first grouting pipe;
the second grouting pipe comprises an inner pipe, a grouting head and a communicating pipe;
the inner pipe is positioned in the first grouting pipe, and the tail end of the inner pipe is hermetically connected with the sealing plate; the tail end of the inner pipe is communicated with a communicating pipe, and the communicating pipe is communicated with a grouting pump of the second slurry;
grouting heads are uniformly distributed on the inner pipe, and the axis of each grouting head is perpendicular to the axis of the inner pipe; the grouting head is communicated with the inner pipe; the number of the grouting heads is the same as that of the grouting holes, and the grouting heads correspond to the grouting holes one by one;
the third tube group comprises a sleeve and a moving tube;
the sleeve is fixed in the communicating pipe; the moving pipe is positioned in the sleeve, and can extend into the inner pipe through the sleeve;
and the pipe is moved, so that grouting can be performed in the inner pipe.
Further, the moving pipe is used for injecting the first slurry into the inner pipe.
Further, a pressure sensor is fixed on the outer side of the grouting hole;
the inner wall of the inner pipe is provided with a chute; the end of the movable pipe is communicated with the movable grouting head which is in sliding fit with the chute,
the length direction of the sliding chute is parallel to the axial direction of the inner pipe, and the grouting heads positioned on the inner pipe are in a group parallel to the axial line of the inner pipe along the connecting line of the grouting heads and the midpoint of the communication position of the inner pipe;
the symmetrical center line of the sliding groove is parallel to the connecting line of the center lines of the bottom ends of a group of grouting heads, and the communicating ports of the group of grouting heads and the inner pipe are located in the width range of the sliding groove, so that the slurry outlet of the movable grouting head can cover the communicating ports of the grouting heads and the inner pipe.
Further, the second grouting pipe further comprises a rotating part;
the tail end of the inner pipe is connected with the through hole in the sealing plate in a rotating and sealing mode, the rotating part comprises an engaging part and a stepping motor, and the stepping motor drives the inner pipe (310) to rotate through the engaging part.
Furthermore, a plurality of groups of grouting heads are arranged on the inner pipe, and each group of grouting heads are uniformly arranged on the cylindrical surface of the inner pipe at intervals;
the part of the moving pipe extending into the inner pipe is a hard pipe, and the distance between the moving pipe and the inner wall of the inner pipe is limited by the sleeve and the moving grouting head, so that the axis of the hard pipe is parallel to the axis of the inner pipe;
the rigid pipe is provided with a positioning vent pipe in a sliding manner, the vent pipe is uniformly communicated with the balloons at intervals, and the number of the balloons is the same as that of the grouting heads; the interval of the saccule is the same as that of the grouting head, and the saccule can correspond to the grouting head in position, so that the end of the saccule after expansion can extend into the grouting head;
the balloon is sleeved with a shaping reticulated shell, and the shaping reticulated shell is a spherical mesh made of photo-curing resin; the opening of the spherical net is larger than the diameter of the balloon in a fully contracted state, but smaller than the diameter of the balloon in an inflated 1/4 state; 1/4 of gas is filled into the saccule, so that the reticulated shell can be positioned outside the saccule and can enter the inner tube through the sleeve;
when the saccule is expanded to the maximum volume state of the shaping reticulated shell, the inner wall of the grouting head is frustum-shaped, and the small-diameter end is far away from the inner pipe; the maximum diameter of the reticulated shell is smaller than the minimum inner diameter of the grouting head, and the reticulated shell can be withdrawn from the grouting head under the pressure of slurry;
an ultraviolet lamp is fixed in the sacculus, and the sacculus is a transparent sac, so that ultraviolet light can irradiate the shaping reticulated shell.
Furthermore, a pipe groove is formed in the bottom surface of the movable pipe, and the vent pipe is in sliding fit with the pipe groove.
Furthermore, the shaping reticulated shell is cut into a circular shape from a plane, then coats the contractible sac, and irradiates ultraviolet light to the part of the opening of the formed spherical surface to make a bag-shaped structure with a hard opening and a soft structure at other parts.
Further, the wall thickness of the shaping reticulated shell is not more than 3mm.
Furthermore, a liquid separating plate is fixed on the grouting holes, and through holes in the liquid separating plate are arranged from large to small on the same straight line passing through the circle center.
Further, the liquid separation plate is an elastic plate.
One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages: the movable pipe is additionally arranged in the inner pipe, so that the first slurry or the mixed slurry of the two slurries can be filled into the inner pipe, the proportional balanced grouting operation is convenient to form, and the grouting pressure is also convenient to control.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the structure with a third tube bank;
FIG. 3 is a schematic view of the chute, the movable grouting head, and the grouting head;
FIG. 4 is a schematic view showing a state where the third tube group is introduced into the inner tube;
FIG. 5 is a schematic view of a fitting structure of a vent tube, a moving tube, a balloon and a shaping reticulated shell;
FIG. 6 is a schematic view showing a comparison of balloon inflation and deflation conditions;
FIG. 7 is a schematic view of a plastic reticulated shell structure;
FIG. 8 is a schematic view of the plastic net shell entering the soil layer;
FIG. 9 is a schematic structural view of a soil layer with a loose area generated without a shaping reticulated shell;
FIG. 10 is a schematic view of a liquid-separating plate;
FIG. 11 is a schematic cross-sectional view of a liquid separation plate;
fig. 12 is a schematic view of the grouting position.
In the figure, a drill 100, a first grouting pipe 200, a grouting hole 210, a liquid separation plate 211, a sealing plate 220, and a liquid injection pipe 230;
a second grouting pipe 300, an inner pipe 310, a chute 311, a grouting head 320, a communicating pipe 330, and a rotating member 340;
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a single embodiment.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The advanced grouting process comprises the following steps of; the shield machine is provided with 8 advanced grouting holes which are arranged along the circumferential direction of the shield shell, and the angle is 6.5 degrees; a hydraulic pump station of an existing segment erector of a shield machine is used as a hydraulic power source of a lead drilling machine (PDF 560L-2400); after the equipment is connected, drilling construction is carried out, the deviation angle is 6.5 degrees, the hole is drilled for 26.5m, and the radial height is 3 m; and (4) after the drilling is finished, adopting retreating type grouting, firstly drilling and then grouting, and grouting at fixed points.
Example one
As shown in fig. 1-3, an advanced grouting process for shield construction includes the following steps: step one, determining a reinforcement grouting position; step two, installing a grouting device and performing drilling operation; grouting the soil layer through a grouting pipeline, wherein in the grouting process, two different kinds of grout are injected into the soil layer through an inner sleeve and an outer sleeve, the first kind of grout is water glass solution, and the second kind of grout is cement paste;
the equipment adopted in the grouting process comprises a first grouting pipe 200, a second grouting pipe 300 and a third pipe group;
the first grouting pipe 200 is a hard pipe and comprises a grouting hole 210, a sealing plate 220 and a liquid injection pipe 230;
the front section of the first grouting pipe 200 is closed, the tail end of the first grouting pipe is sealed by a sealing plate 220, and a liquid injection pipe 230 penetrates through the sealing plate 220 to perform grouting in the first grouting pipe 200; the injection pipe 230 is communicated with a grouting pump of the first slurry;
grouting holes 210 are uniformly formed in the pipe surface of the first grouting pipe 200;
the second grouting pipe 300 includes an inner pipe 310, a grouting head 320, and a communicating pipe 330;
the inner pipe 310 is positioned in the first grouting pipe 300, and the tail end of the inner pipe 310 is hermetically connected with the sealing plate 220; the tail end of the inner pipe 310 is communicated with a communicating pipe 330, and the communicating pipe 330 is communicated with a grouting pump of the second slurry;
grouting heads 320 are uniformly distributed on the inner pipe 310, and the axes of the grouting heads 320 are vertical to the axis of the inner pipe 310; grouting head 320 communicates with inner tube 310; the number of the grouting heads 320 is the same as that of the grouting holes 210, and the grouting heads correspond to the grouting holes one by one;
the third tube set 400 includes a sleeve 410 and a moving tube 420;
the sleeve 410 is fixed in the communicating pipe 330; the moving pipe 420 is positioned in the sleeve 410, and the moving pipe 410 can extend into the inner pipe 310 through the sleeve 420;
the pipe 420 is moved to allow the inner pipe 310 to be grouted.
The uniform mixing of the two grout materials at the grouting holes and the difficulty in controlling the pressure state are high, and a part of the first grout material can be injected into the inner pipe 310 by moving the pipe 420.
The transfer tube 420 is used to inject a first slurry into the inner tube 310.
A pressure sensor is fixed on the outer side of the grouting hole 210;
the inner wall of the inner tube 310 is provided with a sliding chute 311; the end of the movable pipe 420 is communicated with a movable grouting head 421, the movable grouting head 421 is in sliding fit with the chute 311,
the length direction of the sliding chute 311 is axially parallel to the inner pipe 310, and the connecting line of the midpoint of the communication part of the grouting head 320 positioned on the inner pipe 310 and the inner pipe 310 is parallel to the axis of the inner pipe 310, and the grouting heads 320 are in a group;
the symmetrical center line of the sliding groove 311 is parallel to the connecting line of the center lines of the bottom ends of a group of grouting heads 320, and the communication ports of the group of grouting heads 320 and the inner pipe 310 are positioned in the width range of the sliding groove 311, so that the grouting outlet of the movable grouting head 421 can cover the communication ports of the grouting heads 320 and the inner pipe 310.
During actual operation, the state of the slurry invading into the soil layer can be judged according to the pressure value fed back by the pressure sensor at the outer side of the grouting hole 210. The pressure value of a certain grouting hole is obviously higher than the pressure values of other grouting holes, which indicates that the liquid flow resistance around the grouting hole is larger, and conversely, the pressure around the certain grouting hole is obviously lower than the pressure values of other grouting holes, which indicates that the soil layer texture of the area is soft or has larger cracks, and the two conditions can change the position of the movable grouting head 421 through drawing the movable pipe, and independently process a certain grouting hole 210, so that the pressure of a certain grouting hole can be increased. And (3) injecting slurry with higher viscosity, such as water cement ratio or slurry viscosity, into the soft soil layer or the cracked soil layer, so that the flowing of the cracked or loosened part is avoided under the high-pressure impact of the slurry.
The movable grouting head 421 is provided with an electromagnetic valve, and the end of the movable pipe 420 is also provided with an electromagnetic valve, so that the movable pipe 420 can independently feed liquid into the inner pipe 310, and can independently discharge liquid into the grouting hole 210 through the movable grouting head 421.
Example two
The grout fills the soil layer, and between slip casting mouth and soil layer, the grout can break away soil, forms loose region, and this part region, the grout is difficult for the retention, and liquid grout flows to other positions easily, forms the stress concentration area after the hardening, leads to the decline of overall structure bearing capacity. Thus, the following modifications are made as shown in FIGS. 4 to 9.
The second grout pipe 300 further comprises a rotating member 340;
the tail end of the inner tube 310 is connected with the through hole of the sealing plate 220 in a rotating and sealing manner, the rotating member 340 comprises an engaging member and a stepping motor, and the stepping motor drives the inner tube 310 to rotate through the engaging member.
By rotating the inner tube, the moving grouting head 421 can be operated individually for each grouting hole 210.
A plurality of groups of grouting heads 320 are arranged on the inner pipe 310, and each group of grouting heads is uniformly arranged on the cylindrical surface of the inner pipe 310 at intervals;
the part of the moving pipe 420 extending into the inner pipe 310 is a hard pipe, and the distance between the moving pipe 420 and the inner wall of the inner pipe 310 is limited by the sleeve 410 and the moving grouting head 421, so that the axis of the hard pipe 310 is parallel to the axis of the inner pipe 310;
the rigid pipe is provided with a positioning vent pipe 422 in a sliding way, the vent pipe 422 is communicated with the balloons 430 at even intervals, and the number of the balloons 430 is the same as that of the group of grouting heads 320; the spacing of the sacculus 430 is the same as that of the grouting head 320, and the sacculus 430 can correspond to the grouting head 320 in position, so that the end of the expanded sacculus 430 can extend into the grouting head 320;
a shaping reticulated shell 440 is sleeved outside the balloon 430, and the shaping reticulated shell 440 is a spherical mesh made of photo-curing resin; the opening of the spherical net is larger than the diameter of the balloon in a fully contracted state but smaller than the diameter of the balloon in an inflated 1/4 state; inflating the balloon with 1/4 of the gas enables the reticulated shell to be positioned outside the balloon and to enter the inner tube 310 through the sleeve 410; the wall thickness of the shaping reticulated shell 440 is not greater than 3mm.
When the saccule 430 is expanded to the maximum volume state of the shaping reticulated shell 440, the inner wall of the grouting head is frustum-shaped, and the small-diameter end is far away from the inner pipe 310; the maximum diameter of the reticulated shell 440 is smaller than the minimum inner diameter of the grouting head 320, and the reticulated shell 440 can be withdrawn from the grouting head 320 under the pressure of the grout;
an ultraviolet lamp is fixed in the balloon 430, and the balloon is a transparent balloon, so that ultraviolet light can irradiate the shaping reticulated shell 440.
The moving pipe 420 has a pipe groove on the bottom surface, and the vent pipe 422 is slidably fitted with the pipe groove.
The shaping net shell 440 is cut into a circular shape from a plane, then is wrapped by a contractible bag, and partially irradiates ultraviolet light to the opening of the formed spherical surface to form a bag-shaped structure with a hard opening and a soft structure at other parts.
When the inflatable plastic reticulated shell is used, the vent pipe 422 drives the balloon to be pushed to the limit position of the movable pipe 420, the balloon is in one-to-one correspondence with the grouting head 320, then the balloon is inflated through the vent pipe, and whether the inflated plastic reticulated shell reaches the limit of the plastic reticulated shell 440 can be judged through the inflation quantity and the pipeline pressure. After the inflation is finished, the ultraviolet lamp is turned on, the balloon is exhausted after being irradiated for 10-20s, and the molding reticulated shell 440 falls off from the balloon and enters the grouting head 320. At this time, the pressure of the slurry in the inner pipe is increased by 0.01-0.1MPa, so that the molding reticulated shell 440 is clamped in the grouting head 320, and the molding reticulated shell can be tested on the ground or in a laboratory before the grouting pipe enters the soil layer, and the appropriate pressure is selected. Then the inner tube 310 is rotated, and the ventilation tube is pulled back to sleeve a new plastic net shell 440 on the balloon 430, and then the plastic net shell 440 is sent back to the inner tube, and the plastic net shell 440 is arranged in another group of grouting heads 320 until all the grouting heads 320 are clamped with the plastic net shell 440. Then the pressure of the inner pipe is increased, so that the shaping reticulated shell 440 passes through the grouting head and the grouting hole and enters the soil layer. The method has the advantages that the second purpose is that 1, a slurry distribution area is formed outside a grouting hole, the flowing direction of slurry can be artificially limited by the shape of the hole on the shaping reticulated shell, grouting operation on a soil layer is facilitated, the uniformly distributed grouting area is convenient to form, and a hardening structure is continuous and stable; 2. after grouting is finished, if no moulding reticulated shell is arranged, a loose area is arranged at the contact position of a soil layer and a grouting hole, internal grout can naturally flow after grouting is finished in the loose area, the bearing capacity of the area is weaker than that of other parts after the grout is hardened, a stress concentration area is naturally formed when stress load is applied, the integral bearing capacity of the soil layer is reduced, the moulding reticulated shell has the function of forming a bearing shell between the grouting hole and the soil layer, the grout is filled inside and outside the shell, the grout is prevented from naturally flowing out of the shell, the integral structure of the soil layer is continuous and complete after hardening, and stress concentration points are reduced or avoided.
The mesh size on the shaping reticulated shell 440 can also be set to be non-uniformly distributed, with a maximum of 5mm and a minimum of 2mm. Of course, the adaptability can be modified according to the physical and chemical characteristics of the actual grouting slurry.
EXAMPLE III
The grout holes may be modified without the shaping of the reticulated shell, as shown in figures 10-11.
The liquid separating plate 211 is fixed on the grouting hole 210, and the through holes on the liquid separating plate 211 are arranged from large to small on the same straight line passing through the center of a circle.
The through holes which are arranged non-uniformly can effectively avoid that when slurry impacts the soil layer, the slurry enters the soil layer from one or more channels regularly, so that the slurry is distributed non-uniformly in the soil layer.
The liquid separation plate 211 is an elastic plate.
Therefore, under the action of slurry pressure, the plate body deforms, holes in the plate body incline to the periphery, and the grouting direction is more uniform. The plate body may be a plate made of rubber.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. An advanced grouting process for shield construction comprises the following steps: step one, determining a reinforcing grouting position; step two, installing a grouting device and performing drilling operation; step three, grouting the soil layer through a grouting pipeline, wherein in the grouting process, two different kinds of grout are injected into the soil layer through an inner casing and an outer casing, the first kind of grout is water glass solution, and the second kind of grout is cement paste;
the equipment adopted in the grouting process comprises a first grouting pipe (200), a second grouting pipe (300) and a third pipe group;
the first grouting pipe (200) is a hard pipe and comprises a grouting hole (210), a sealing plate (220) and a liquid injection pipe (230);
the front section of the first grouting pipe (200) is closed, the tail end of the first grouting pipe is sealed by a sealing plate (220), and a liquid injection pipe (230) penetrates through the sealing plate (220) to inject slurry into the first grouting pipe (200); the liquid injection pipe (230) is communicated with a grouting pump of the first slurry;
grouting holes (210) are uniformly formed in the surface of the first grouting pipe (200);
the second grouting pipe (300) comprises an inner pipe (310), a grouting head (320) and a communicating pipe (330);
the inner pipe (310) is positioned in the first grouting pipe (200), and the tail end of the inner pipe (310) is hermetically connected with the sealing plate (220); the tail end of the inner pipe (310) is communicated with a communicating pipe (330), and the communicating pipe (330) is communicated with a grouting pump of second slurry;
grouting heads (320) are uniformly distributed on the inner pipe (310), and the axial line of the grouting heads (320) is vertical to the axial line of the inner pipe (310); the grouting head (320) is communicated with the inner pipe (310); the number of the grouting heads (320) is the same as that of the grouting holes (210), and the positions correspond to one another;
the third tube set (400) comprises a casing tube (410) and a moving tube (420);
the sleeve (410) is fixed in the communicating pipe (330); the moving pipe (420) is positioned in the sleeve (410), and the moving pipe (420) can extend into the inner pipe (310) through the sleeve (410);
a movable pipe (420) which can inject slurry into the inner pipe (310);
the moving pipe (420) is used for injecting first slurry into the inner pipe (310);
a pressure sensor is fixed on the outer side of the grouting hole (210);
the inner wall of the inner tube (310) is provided with a sliding groove (311); the end of the movable pipe (420) is communicated with a movable grouting head (421), the movable grouting head (421) is in sliding fit with the sliding groove (311),
the length direction of the sliding chute (311) is axially parallel to the inner pipe (310), and the grouting heads (320) which are positioned on the inner pipe (310) and are parallel to the axis of the inner pipe (310) form a group by connecting the midpoint of the connection position of the grouting heads (320) on the inner pipe (310) and the inner pipe (310);
the symmetrical center line of the sliding groove (311) is parallel to the connecting line of the center lines of the bottom ends of a group of grouting heads (320), and the communication ports of the group of grouting heads (320) and the inner pipe (310) are located in the width range of the sliding groove (311), so that the communication ports of the grouting heads (320) and the inner pipe (310) can be covered by the slurry outlet of the movable grouting head (421).
2. The shield construction advanced grouting process according to claim 1, wherein the second grouting pipe (300) further comprises a rotating part (340);
the tail end of the inner pipe (310) is connected with the through hole in the sealing plate (220) in a rotating and sealing mode, the rotating part (340) comprises an engaging part and a stepping motor, and the stepping motor drives the inner pipe (310) to rotate through the engaging part.
3. The shield construction advanced grouting process according to claim 1, characterized in that a plurality of groups of grouting heads (320) are arranged on the inner pipe (310), and each group of grouting heads is uniformly arranged on the cylindrical surface of the inner pipe (310) at intervals;
the part of the moving pipe (420) extending into the inner pipe (310) is a hard pipe, and the distance between the moving pipe and the inner wall of the inner pipe (310) is limited by the sleeve (410) and the moving grouting head (421), so that the axis of the hard pipe is parallel to the axis of the inner pipe (310);
the rigid pipe is provided with a positioning vent pipe (422) in a sliding manner, the vent pipe (422) is communicated with the balloons (430) at uniform intervals, and the number of the balloons (430) is the same as that of the group of grouting heads (320); the spacing of the sacculus (430) is the same as that of the grouting head (320), and the sacculus (430) can correspond to the grouting head in position, so that the end of the sacculus (430) after being expanded can extend into the grouting head (320);
a shaping reticulated shell (440) is sleeved outside the saccule (430), and the shaping reticulated shell (440) is a spherical mesh made of photo-curing resin; the opening of the spherical net is larger than the diameter of the balloon in a fully contracted state, but smaller than the diameter of the balloon in an inflated 1/4 state; filling the balloon with 1/4 of gas to enable the reticulated shell to be positioned outside the balloon and to enter the inner tube (310) through the sleeve (410);
when the saccule (430) is expanded to the maximum volume state of the shaping reticulated shell (440), the inner wall of the grouting head is frustum-shaped, and the small-diameter end is far away from the inner pipe (310); the maximum diameter of the reticulated shell (440) is smaller than the minimum inner diameter of the grouting head (320), and the reticulated shell (440) can be withdrawn out of the grouting head (320) under the pressure of the slurry;
an ultraviolet lamp is fixed in the sacculus (430), and the sacculus is a transparent sacculus, so that ultraviolet light can irradiate the shaping reticulated shell (440).
4. The advanced grouting process for shield construction according to claim 3, wherein the moving pipe (420) is provided with a pipe groove on the bottom surface, and the vent pipe (422) is in sliding fit with the pipe groove.
5. The advanced grouting process for shield construction according to claim 3, wherein the shaping reticulated shell (440) is cut into a circular shape from a plane, then covers the contractible bag, and partially irradiates ultraviolet light on the formed spherical opening to form a bag-shaped structure with a hard opening and a soft structure at other parts.
6. The shield construction advanced grouting process according to claim 3, wherein the wall thickness of the shaping reticulated shell (440) is not more than 3mm.
7. The shield construction advanced grouting process according to claim 1, wherein a liquid separation plate (211) is fixed on the grouting hole (210), and through holes in the liquid separation plate (211) are arranged from large to small on the same straight line passing through the center of a circle.
8. The shield construction advanced grouting process according to claim 7, wherein the liquid separation plate (211) is an elastic plate.
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| CN102080552B (en) * | 2010-12-14 | 2012-12-12 | 山东大学 | Underground double liquid grouting process and underground double liquid grouting machine thereof |
| CN108265720A (en) * | 2018-01-25 | 2018-07-10 | 天津大学 | A kind of single-point bellows grouting device and its method for controlling soil deformation |
| CN108716405B (en) * | 2018-05-22 | 2019-10-25 | 中铁十局集团青岛工程有限公司 | Constructing tunnel dual slurry grouting construction method |
| KR20190122135A (en) * | 2019-03-18 | 2019-10-29 | 광성지엠(주) | Simultaneous injection device using straight punching steel pipe and construction method thereof |
| CN111074899A (en) * | 2019-11-11 | 2020-04-28 | 中铁七局集团第二工程有限公司 | Grouting method for karst caves with different filling types |
| CN112030964B (en) * | 2020-08-28 | 2021-07-09 | 浙大城市学院 | Positioning grouting anchor rod suitable for engineering seepage damage prevention and control and construction method thereof |
| CN112879050B (en) * | 2021-02-10 | 2022-09-27 | 中国电建集团成都勘测设计研究院有限公司 | Waterproof structure of drainage type tunnel primary support system and construction method thereof |
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2022
- 2022-12-20 CN CN202211638089.5A patent/CN115614046B/en active Active
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